to feel a bit disappointed in MIL?

I gave birth to DS3 a week ago . MIL & FIL live 3 hours away and rarely come to visit - around twice a year. She came a couple of months ago and said she would come and stay for a week when DS3 was born (she came to see us the next day after both other DS's were born). She could have come this week but hasn't and now says she isn't sure when she can come as she is getting a new boss at work and will have to speak to them... She could come this Sunday but her and FIL go out every w/e and get very drunk so she doesn't want to have to stay in on Saturday night. I wouldn't mind so much but I broke my foot a week before baby arrived and DH is ill so we are finding it quite hard, AIBU & being a sleep deprived fool to feel annoyed by this?!

I know! DH's family are pretty distant, FIL & his wife live 2 hours away and we haven't seen them for a year, his sister hasn't called or texted even to say congratulations on DH£'s birth & MIL and her DH would rather spend their w/e's getting paralytic than coming to see their grandchildren, I often wonder what it would be like to have in laws who were more involved - better or worse?!

Just spoken to MIL and she is off out drinking tonight, hasn't even asked her new boss about coming to see us yet and doesn't even have snow as an excuse! I guess she and her husband would be missing out on valuable drinking time if they came between now and new year Also FIL was meant to come today but phoned and cancelled.... Turns out sister in law and her kids were staying over with a friend of theirs 10 minutes away from us last night, didn't even call us or pop into meet new nephew